Step stool



FIG. 1 is a perspective view of the step stool;

FIG. 2 is a top plan view of the step stool of FIG. 1;

FIG. 3 is a bottom plan view of the step stool of FIG. 1;

FIG. 4 is a front elevation view of the step stool of FIG. 1;

FIG. 5 is a rear elevation view of the step stool of FIG. 1; and,

FIG. 6 is a left side elevation view of the step stool of FIG. 1, the right side elevation view being a mirror image thereof. 

The ornamental design for the step stool, as shown and described. 